How to use io stream to copy pictures in java

java.io provides many stream classes. Here we are going to use FileInputStream/FileOutputStream----for reading raw bytes

（ Recommended tutorial:java introductory tutorial)

First we copy a picture into the current directory, for example: "d:/java/TestPicture/image1.jpg", and then we use FileInputStream Read the picture, and finally FileOutputStream generates a picture as image2.jpg in the current directory.

(Video tutorial recommendation:java video tutorial)

java code:

import java.io.*; public class TestPictureCopy{ public static void main(String []args)throws Exception{ //会抛异常，所以我们在主函数中给抛出去 //输入流 FileInputStream fis=new FileInputStream("image1.jpg"); //输出流 FileOutputStream fos=new FileOutputStream("image2.jpg"); //我们用read(byte[]b,int off,int len)函数来读-确保两张图片大小一致，且效率还高 byte[] b=new byte[1024]; int num=0; while((num=fis.read(b,10,1000))!=-1){ fos.write(b,10,num); } fis.close(); fos.close(); } }

See if image1.jpg has been generated in the current directory Replicaimage2.jpg.

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